Face-to-face with some of America's most terrifying killers, FBI veteran and ex-Army CID colonel Robert Ressler learned from them how to identify the unknown monsters who walk among us - and put them behind bars. Now the man who coined the phrase "serial killer" and advised Thomas Harris on The Silence of the Lambs shows how he has tracked down some of the nation's most brutal murderers. Join Ressler as he takes you on the hunt for America's most dangerous psychopaths. It is a terrifying journey you will not forget.